Shoe-sewing machine.



W. C. MEYER.

SHOE SEWING MACHINE.- APPLICATION FILED NOV. 4, 1904.

Patented Feb. 13, 1912.

3 SHEETS-SHEET l.v

' W. G.'MEYER.

SHOE SEWING MACHINE.

APPLICATION FILED NOV.4,1904.

Patented Feb. 13, 1912.

3 SHEETS-SHEET 2.

gait @6566- W. O. MEYER.

SHO-E SEWING MACHINE.

APPLICATION FILED NOV. 4,1904, I 1 0 340, Patented Feb. 13, 1912.

3 SHEETS-SHEET 3.

ZQZZ? I 6 during the thread it is much more tension which the thread theretracting stroke of the needle deteriinin ea Flt];

WILLIAM C. MEYER, F BOSTON, MASSACHUSETTS, ASSIGNOR TO UNITED SHOEMACHINERY COMPANY, OF PATERS ON, NEW JERSEY, A CORPORATION (IF NEWJERSEY.

SHOE-SEWING MACHINE.

To all whom it may concern Be it known that I, \VILLIAM C. Marne, acitizen of the United States, residing at Boston, in the county ofSuffolk and State of Massachusetts, have invented certain new and usefulImprovements in Shoe-Sewing Machines; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable other skilled in the artto which it appertains tomake and use the same.

The present invention relates to an improvement in sewing machines andmore particularly in sewing machines of I the curved hook needle,chain-stitch wax-thread type known welt and turn machines.

In the operation ofthe well-known Goodyear welt and turn machine,illustrated with substantial accuracy in the patent to French and Meyer,No. 412,?0t, dated Octo her 8, 1889, the stitch is set by the take-upwhich pulls upon the loop of thread standing around the shank of theneedle while the latter is in the work thereby bringing the thread whichforms the stitch into its final position in the seam. Inasmuch as thetightness of the seam depends upon the tension upon the thread at thistime this machine in practical operation has been run under as great atension as the thread would stand, but this tension has been measurednot by the liability of the thread 'to break at this time in theoperation of the machine, but by the liability of the thread to breaklast part of the retracting stroke This is because during the threadpulling stroke of the take-up the thread extends around the softmaterial of the between substance and the smooth surface of the shank ofthe needle while during the last part of the retracting stroke of theneedle the thread is bent around and reeves slightly through the smallthroat of the needle so that with the same strain on the liable to breakat Thus it will be seen that the would stand during of the needle.

this time.

mined the maximum tension which could be used on the machine andprecluded the use of as much tension as was desired, and in tactdesirable, to be used during the opera .tion of the take-up. The objectof the'present invention is to reorganize and improve the chain-stitchSpecification of Letters Patent.

Application filed November 4, 1904.

invention and will Patented Feb. 13, 1912. Serial No. 231,342.

tension mechanism operating to subject the thread to certain tensionduring the time the needle is making its retracting stroke and to acertain increased tension during the time the take-up is acting totighten the loop of thread standing around the shank of the needle whileit is in the materials.

Other features of the invention will be pointed out in connection withthe description of the illustrated embodiment of the be specificallydefined in the claims. In the accompanying drawings illustratmg thepreferred form of the invention, shown in connection with the well-knownGoodyear welt and turn machine which is illustrated with substantialaccuracy in the patent ream- 1 to, only so much of the machine is shownas is necessary for a complete understanding or" the present inventionand the parts not herein referred to may be, and preferably are, thesame as in said patented machine.

Figure l is a side elevation of the machine, unessential parts beingomitted. Fig. 2 1s rear elevation and Fig. 3 is a plan showing thetension. device in section.

The illustrated embodiment of the invention is described as follows :Theneedle N, the take-up T, the auxiliary take-up t, the looper L, thethread finger F, the welt guide G (back gage, in case of a turn machine)and back rest R are constructed, organized and operated in substantiallythe manner illustrated and described in said patent:- The tension wheelor thread truck JV is loosely mounted upon the st d l secured in thebracket 2 projected rearwardly fro and secured to the rear portion ofthe head H of the machine. This thread truck 4V may be of any usualconstruction, the illustrated embodiment thereof consisting of twoplates 3 and 4 provided with intermeshing fingers and forming thereby agroove for the reception of the thread which disks or plates areembraced upon opposite sides by plates 5 and 6 clamped together byrivets 7. Mounted upon and secured to the thread truck Wzis abrake wheel8 which is conveniently secured to the thread truck W by the rivets 7above referred to, Eelt washers '9 and 10 m I int-r,

' ception of the brake wheel 8 the foregoing construction issubstantially identical with the corresponding parts in said patentedn1a- The tension releasing lever 16 is conchine. nected by the chain 18with the bell crank lever 19 which in turn supports the rod 20 by whichconnection is had with the main shaft of the machine in the mannerillustrated in the patent to La Chapelle, No. 488,505, December 20,1892. The brake wheel 8 is adapted to be borne upon by the brake shoe2]. provided with a felt face. The brake shoe is carried by the lever.22 pivoted at .28 ina double support 2% projected upward from thetension bracket 2. Theopposite end of the lever 22 is pivotallyconnected with a rod 25 which passes through a hole in a pin 26 carriedby the arm 27 of the cam lever pivoted at .29 upon a stationary part ofthe machine. The cam lever is provided upon its other arm 28 with a camroll which enters a cam path in the cam. disk 30 mounted upon the mainshaft of the machine. The rod 25 is provided below the pin 26 with anadjusting nut 31 and a set not 32. The rod 25 above the pin 26 isembraced by a spring 38 which bears upon the pin 26 at one end and upona washer 34 held in place on the rod 25 by a nut 35. The nuts Stand 35afford means of adjustment.

It has not beenconsidered necessary to illustrate the cam path in thecam disk '30 by means of which the supplemental tension is operated, asany person skilled in the artcould construct the same from the presentdescription without the exercise of more,

. than the ordinary skill of the designer.

tension exerted upon the thread by the trio- The above described.arrangement is such that during the running of the machine the .tion ofthe felt washers 9 and 10 upon the spring 12, is constant.

tension wheel, owing to the pressure of This tension will be referred toas the normal tension. It'determines the/tensionupon the threadat alltimes during the operation of the machine except during-those timeswhenthe extraordinary or supplemental tension is exerted thereon by whatwill be termed the supplemental tension, which is enerted by the brakeshoe 21 upon the brake wheel. '8. This sup-- 7 fplemental tension istimed with relation to the takaup so that it is exerted during the timethe take-up 'isrising, that is to say, dur- The washer 11 isprovidedneedle, and means for exerting an increased tensionupon thethread during the time the take-up is making its thread pulling stroke.

It is to be notedthat it is only essential that the normal tension beexerted upon the thread during the last .part of the retracting strokeof the needle because this is the only time during its retracting strokewhen the thread is liable to reeve through the throat of the needleunder strain.

plemental tension be applied during that portion of the stroke of thetake-up while it is acting to set the stitch.

It is to be observed that while I have described my invention asembodied in a Ina-1; chine 1n which the normal and the supple mentaltension are both applied to the thread through the same tension wheel bymeans of two devices which, the one constantly and the otherintermittently, act thereon, my invention is not necessarily limited tosuch construction as other forms of mechanism might be substitutedtherefor without departure from the invention. For example, it is notessential to my invention, viewed in its broader aspects, that thespring exerting the normal resistance to the rotation of the tensionwheel should act thereon while the supplemental tension is acting.Again, it will be understood that it is within the purview of myinvention entirely to dispense withjthe spring 12 and to provide a campath tor-actuating a single tensionrel-easing device he provided for useI Furthermore, it 15 only essential that the increased or sup tilt lild

in removing the sewed shoe from the machine. This tension releasingdevice is the same as that described and illustrated in the patent to LaChapel'la' llt will be understood that the intermittently actingsupplemental tension is exerted upon the thread only during the time thetake-up is rising, and consequently that it is not exerted upon thethread when the needle is back and.

when the parts are in the position which.

be embodied in other and different forms within the purview of myinvention as described herein.

lVhat is claimed is l. A chain-stitch, shoe sewing machine, having, incombination, a needle, a looper, a stitch setting take-up, a constantlyacting normal tension, and an intermittently acting supplemental tensionoperating during the stitch-setting movement of the take-up to increasethe tension on the thread, substantially as described.

2. A chainstitch, shoe sewing machine, havi-ng,in combination, a needle,a looper, a stitch-setting take-up, a normally operative tensionmechanism for exerting a constant tension upon the thread during theoperation of the machine, a supplementary ten sion mechanism operativeduring the setting of the stitch, and means for relieving the constanttension to remove and enter the work, substantially as described.

3. A chain-stitch, shoe sewing machine, having, in combination, aneedle, a looper, a stitch-setting take-up, a tension mechanism actingto exert tension upon the thread during the retracting stroke of theneedle, and a supplementary tension mechanism acting to increase thetension exerted. upon the thread during the stitch setting movement ofthe take-up, substantially as described.

4:. A chain-stitch, shoe sewing machine, having, in combination, aneedle, a looper, a stitclrsetting take-up, a tension device operatingto exert a uniform and relatively light tension upon the thread duringthe re tracting stroke of the needle and an increased tension during thesetting of the stitch, and means for adjusting the tension device tovary the amount of increase in the tension without affecting the uniformand relatively light tension exerted thereby on the thread during theretracting stroke of the needle, substantially as described.

In testimony whereof Iaflix my signature, in presence of two Witnesses.

I WILLIAM C. MEYER.

\Vitnesses:

HORACE VAN EVEREN, ALFRED H. HILDRETH.

